John's instructional program has successfully increased the number of words he reads correctly per minute.

John's instructional program has successfully increased the number of words he reads correctly per minute. The procedures used include special worksheets, contingent reinforcement for number of words read correctly, and peer tutoring. The behavior analyst wants to determine which part or parts of the treatment have been effective, so he systematically dismantles the treatment and withdraws elements until the reading no longer improves. The behavior analyst is completing A.